Grate.



P. W. STURDEVANT.

GRATE.

APPLICATION FILED AUG. 18, 1911.

Patented Aug. 2'7, 1912.

Fdg. 6

llllllllllllllllll W N E V WW @JM 0 k m m ATTORNEY COLUMBIA PLANOGRAPH 60-. WASHINGTON. D. c.

FRANK W. STURDEVANT, OF EAST NORWALK, CONNECTICUT.

Specification of Letters ratent.

Application filed August 18, 1911.

Patented Aug. 27, 1912.

Serial No. 644,817.

To all whom it may concern:

Be it knownthat I, FRANK W. Srunnn- VAN'I, a citizen of the United States, residing at East Norwalk, county of Fairfield, State of Connecticut, have invented an Improvement in Grates, of which the following is a specification.

This invention relates to furnace grates and has reference more particularly to grates of the type employing a series of rocking bars having at their upper edges teeth which collectively form a bed for the fuel and which, when said bars are rocked, serve to agitate the fuel, shake down ashes, and break up clinkers.

The objects of the invention, together with means whereby the same may be carried into effect, will best be understood from the following description of one form or embodiment thereof illustrated in the accompanying drawing. It will be understood however that the invention is not limited to the construction shown and described but may be embodied in other forms without departing from the spirit and scope thereof.

In said drawings: Figure 1 is a side elevation, partly broken away, of a portion of the grate. Fig. 2 is a detail elevation of one of the rocking bars with the teeth removed. Fig. 3 is a plan view of a portion of the grate with the supporting brackets in section, a part only of the teeth being in position on the rocking bars. Fig. 1 is a side elevation, partly broken away, of a portion of the grate showing the bars in rocked position. Figs. 5 and 6 are, respectively, an elevation and a plan, on an enlarged scale, of one of the detachable teeth.

Referring to the drawings 10 designates the grate frame secured in place in the furnace in any suitable manner, as by being bricked into the side walls of the fire-box, said frame being preferably bent to form end members 31 correspondingly secured.

11 denotes the rocking grate bars provided with trunnions 12 entering suitable openings in the grate frame 10.

13 denotes stationary bars located at opposite ends of the grate and secured to the grate frame 10 by angular lugs 14: entering correspondingly shaped openings insaid frame. V

The bars 11 and 12 are provided on oppo-. site sides throughout their length with spaced ribs 15 for positioning the detachable teeth. The rocking bars 11 are further provided with depending arms 16 having at their lower ends, and preferably integral therewith, headed studs 17 which are engaged in key-hole slots 18 in a shaking bar 19 which is preferably connected in any suitable manner with a shaking lever (not shown) at the front of the furnace whereby the bars 11 may be simultaneously rocked upon their trunnions and the grate shaken.

20 denotes the detachable teeth each comprising a single plate which is substantially flat except as hereinafter noted and formed with a pair of depending legs 21 arranged to straddle the bars 11 between the ribs 15, said legs being of slightly less thickness than the width of the spaces between said ribs 15. The inner edges of the legs 21 are rounded, as shown most clearly in Fig. 5, these rounded edges, together with the slight clearance provided between the legs 21 and ribs 15, permitting the teeth 20 to rock laterally on the bars 11 and clear themselves of clinkers or other small particles tendingto clog the space between them. The upper end of the space between the legs 21 is preferably formed on thearc of a circle, as shown in Fig. 5, to fit the curved upper edges of the bars 11. (see Fig. 1). At their upper sides the teeth 20 are formed with oppositely extended arms 22 and 23 of unequal length, the upper edges 24: and 25 of said arms being oppositely inclined from the center of the tooth, and the lower edges 32 thereof being curved outwardly and upwardly. The teeth 20 are slightly thinner at their central portions than at the outer ends of the arms 22 and 23, as shown most clearly in Fig. 6, to provide increased air spaces between the teeth over the rocker bars 11, thereby compensating for the obstruction otherwise offered by these bars and providing for a more even endsof the arms 22 or 23 of the teeth 20 on the bars 11 in the -same manner as the teeth on adjacent rocking bars, the other arm 30 on each of the teeth 28 being of a length to extend to a point sub. stantially close to the end members 31 of thetrame' 1 0. The arms 29 of theteeth-28 at one end of the grate are of different length than the arms 29 at the opposite end of the grate, while the arms 30 of all of the teeth 28 are ofthe same length, the ends of all of said arms 30 of the teeth on the re-: spective bars 13 lying in substantially the 3'. same Vertical plane.

When the bar 19 is operated to shake the furnace the ends of the arms :22 and 23 on the-teeth are forced up into the bed of clinkers and ash, breaking it up, the broken material thereafter passing through the spaces between adjacent bars 11 when these bars are in rocked position, as will be obvi ous from Fig. 4.

As will now be seen the construction described provides a grate adapted effectually to agitate the fuel placed thereon and particularly to break up and dispose of the ashesand clinkers. It will also be seen that by the provision of separately and independently removable teeth of the form shown breakage orwear of'any portion of any tooth can be easily, quickly, and cheaply repaired by removing the broken tooth and replacing the same by a new one. More over the arrangement of the teeth on the bars 11 with their longer arms all in the same direction, together with the lateral movabilit yof said teeth on said bars obviates all possibilityof clogging. Furthermore the form of the teeth with central portions over the rocker bars thinner than their outer edges away from these bars provides-for a substantially uniform air space and an even draft over the entire area of the grate.

" spaced-aparttransverse ribs, means for simultaneously rocking said bars, and independently removable teeth having depending legs constructed to straddle said bars and disposed loosely within the spaces between" the ribs to permit the teeth to have lateralmovement on the rocking bars.

2. A grate comprising a series of rocking bars provided on their opposite sides with spaced apart transversely extended ribs, means for simultaneously rocking said bars,

and independently removable teeth having depending legs adapted to loosely straddle said bars between said ribs, said legs being providedwith rounded edges to permit the teeth to have lateral movement -on the rocking bars. i i

3. A grate comprising a series of rocking bars, and teeth on said bars provided with laterally extended arms the loweredges-of which are curved upwardly and outwardly, the top edges being inclined downwardly ,from the intermediate portion, the ends of said teeth being thicker thanthelintermedi ate portions thereof which are directly above said rocking-bars- 4:. A grate comprising a series of rocking bars, and teeth detachably mounted on said bars, each of said teeth comprising a substantially flat plate provided with-depend ing legs constructed to straddle one of said bars, the top edges of said teeth being inclined downwardly from the intermediate ing bars, the longer arms of all of said teeth .extending in the same direction.

6. A grate comprising a series of rocking bars, and teeth on said bars, the portions of said teeth lying immediately over said bars being of less thickness than the portions thereof extending away therefrom.

7. A grate comprising a series of rocking bars, and teeth on said bars, each tooth being provided with depending legsconstructed to straddle one of said bars, and also with oppositely extended arms, the portions of said teeth lying immediately over said bars being of less thickness than the extremities of said arms.

S. A grate comprising a series of rocking bars, and teeth mounted on said bars, each of said teeth comprising a substantially flat plate provided with depending legs constructed to straddle one of said bars, the inner edgesof said legs being rounded to form a bearing constructed to permit the tooth to rock laterally.

In testimony whereof I aflix my'signature in presence of two witnesses.

FRANK W. STURDEVANT.

Witnesses:

FRANK T. BRUNDAGE EMMA J. BRUNDAGE.

' Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G. V 

